/*! *****************************************************************************
Copyright (C) Microsoft. All rights reserved.
Licensed under the Apache License, Version 2.0 (the "License"); you may not use
this file except in compliance with the License. You may obtain a copy of the
License at http://www.apache.org/licenses/LICENSE-2.0

THIS CODE IS PROVIDED ON AN *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED
WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE,
MERCHANTABLITY OR NON-INFRINGEMENT.

See the Apache Version 2.0 License for specific language governing permissions
and limitations under the License.
***************************************************************************** */
namespace Reflect {
  // Metadata Proposal
  // https://rbuckton.github.io/reflect-metadata/

  type HashMap<V> = Record<string, V>;

  interface BufferLike {
    [offset: number]: number;
    length: number;
  }

  type IteratorResult<T> = { value: T, done: false } | { value: never, done: true };

  interface Iterator<T> {
    next(value?: any): IteratorResult<T>;
    throw?(value: any): IteratorResult<T>;
    return?(value?: T): IteratorResult<T>;
  }

  interface Iterable<T> {
    "@@iterator"(): Iterator<T>;
  }

  interface IterableIterator<T> extends Iterator<T> {
    "@@iterator"(): IterableIterator<T>;
  }

  interface Map<K, V> extends Iterable<[K, V]> {
    size: number;
    has(key: K): boolean;
    get(key: K): V;
    set(key: K, value?: V): this;
    delete(key: K): boolean;
    clear(): void;
    keys(): IterableIterator<K>;
    values(): IterableIterator<V>;
    entries(): IterableIterator<[K, V]>;
  }

  interface MapConstructor {
    new(): Map<any, any>;
    new <K, V>(): Map<K, V>;
    prototype: Map<any, any>;
  }

  interface Set<T> extends Iterable<T> {
    size: number;
    has(value: T): boolean;
    add(value: T): this;
    delete(value: T): boolean;
    clear(): void;
    keys(): IterableIterator<T>;
    values(): IterableIterator<T>;
    entries(): IterableIterator<[T, T]>;
  }

  interface SetConstructor {
    new(): Set<any>;
    new <T>(): Set<T>;
    prototype: Set<any>;
  }

  interface WeakMap<K, V> {
    clear(): void;
    delete(key: K): boolean;
    get(key: K): V;
    has(key: K): boolean;
    set(key: K, value?: V): WeakMap<K, V>;
  }

  interface WeakMapConstructor {
    new(): WeakMap<any, any>;
    new <K, V>(): WeakMap<K, V>;
    prototype: WeakMap<any, any>;
  }

  type MemberDecorator = <T>(target: Object, propertyKey: string | symbol, descriptor?: TypedPropertyDescriptor<T>) => TypedPropertyDescriptor<T> | void;
  declare const Symbol: { iterator: symbol, toPrimitive: symbol };
  declare const Set: SetConstructor;
  declare const WeakMap: WeakMapConstructor;
  declare const Map: MapConstructor;
  declare const global: any;
  declare const crypto: Crypto;
  declare const msCrypto: Crypto;
  declare const process: any;

  /**
    * Applies a set of decorators to a target object.
    * @param decorators An array of decorators.
    * @param target The target object.
    * @returns The result of applying the provided decorators.
    * @remarks Decorators are applied in reverse order of their positions in the array.
    * @example
    *
    *     class Example { }
    *
    *     // constructor
    *     Example = Reflect.decorate(decoratorsArray, Example);
    *
    */
  export declare function decorate(decorators: ClassDecorator[], target: Function): Function;

  /**
    * Applies a set of decorators to a property of a target object.
    * @param decorators An array of decorators.
    * @param target The target object.
    * @param propertyKey The property key to decorate.
    * @param attributes A property descriptor.
    * @remarks Decorators are applied in reverse order.
    * @example
    *
    *     class Example {
    *         // property declarations are not part of ES6, though they are valid in TypeScript:
    *         // static staticProperty;
    *         // property;
    *
    *         static staticMethod() { }
    *         method() { }
    *     }
    *
    *     // property (on constructor)
    *     Reflect.decorate(decoratorsArray, Example, "staticProperty");
    *
    *     // property (on prototype)
    *     Reflect.decorate(decoratorsArray, Example.prototype, "property");
    *
    *     // method (on constructor)
    *     Object.defineProperty(Example, "staticMethod",
    *         Reflect.decorate(decoratorsArray, Example, "staticMethod",
    *             Object.getOwnPropertyDescriptor(Example, "staticMethod")));
    *
    *     // method (on prototype)
    *     Object.defineProperty(Example.prototype, "method",
    *         Reflect.decorate(decoratorsArray, Example.prototype, "method",
    *             Object.getOwnPropertyDescriptor(Example.prototype, "method")));
    *
    */
  export declare function decorate(decorators: (PropertyDecorator | MethodDecorator)[], target: any, propertyKey: string | symbol, attributes?: PropertyDescriptor | null): PropertyDescriptor | undefined;

  /**
    * Applies a set of decorators to a property of a target object.
    * @param decorators An array of decorators.
    * @param target The target object.
    * @param propertyKey The property key to decorate.
    * @param attributes A property descriptor.
    * @remarks Decorators are applied in reverse order.
    * @example
    *
    *     class Example {
    *         // property declarations are not part of ES6, though they are valid in TypeScript:
    *         // static staticProperty;
    *         // property;
    *
    *         static staticMethod() { }
    *         method() { }
    *     }
    *
    *     // property (on constructor)
    *     Reflect.decorate(decoratorsArray, Example, "staticProperty");
    *
    *     // property (on prototype)
    *     Reflect.decorate(decoratorsArray, Example.prototype, "property");
    *
    *     // method (on constructor)
    *     Object.defineProperty(Example, "staticMethod",
    *         Reflect.decorate(decoratorsArray, Example, "staticMethod",
    *             Object.getOwnPropertyDescriptor(Example, "staticMethod")));
    *
    *     // method (on prototype)
    *     Object.defineProperty(Example.prototype, "method",
    *         Reflect.decorate(decoratorsArray, Example.prototype, "method",
    *             Object.getOwnPropertyDescriptor(Example.prototype, "method")));
    *
    */
  export declare function decorate(decorators: (PropertyDecorator | MethodDecorator)[], target: any, propertyKey: string | symbol, attributes: PropertyDescriptor): PropertyDescriptor;

  /**
    * A default metadata decorator factory that can be used on a class, class member, or parameter.
    * @param metadataKey The key for the metadata entry.
    * @param metadataValue The value for the metadata entry.
    * @returns A decorator function.
    * @remarks
    * If `metadataKey` is already defined for the target and target key, the
    * metadataValue for that key will be overwritten.
    * @example
    *
    *     // constructor
    *     @Reflect.metadata(key, value)
    *     class Example {
    *     }
    *
    *     // property (on constructor, TypeScript only)
    *     class Example {
    *         @Reflect.metadata(key, value)
    *         static staticProperty;
    *     }
    *
    *     // property (on prototype, TypeScript only)
    *     class Example {
    *         @Reflect.metadata(key, value)
    *         property;
    *     }
    *
    *     // method (on constructor)
    *     class Example {
    *         @Reflect.metadata(key, value)
    *         static staticMethod() { }
    *     }
    *
    *     // method (on prototype)
    *     class Example {
    *         @Reflect.metadata(key, value)
    *         method() { }
    *     }
    *
    */
  export declare function metadata(metadataKey: any, metadataValue: any): { (target: Function): void; (target: any, propertyKey: string | symbol): void; };

  /**
    * Define a unique metadata entry on the target.
    * @param metadataKey A key used to store and retrieve metadata.
    * @param metadataValue A value that contains attached metadata.
    * @param target The target object on which to define metadata.
    * @example
    *
    *     class Example {
    *     }
    *
    *     // constructor
    *     Reflect.defineMetadata("custom:annotation", options, Example);
    *
    *     // decorator factory as metadata-producing annotation.
    *     function MyAnnotation(options): ClassDecorator {
    *         return target => Reflect.defineMetadata("custom:annotation", options, target);
    *     }
    *
    */
  export declare function defineMetadata(metadataKey: any, metadataValue: any, target: any): void;

  /**
    * Define a unique metadata entry on the target.
    * @param metadataKey A key used to store and retrieve metadata.
    * @param metadataValue A value that contains attached metadata.
    * @param target The target object on which to define metadata.
    * @param propertyKey The property key for the target.
    * @example
    *
    *     class Example {
    *         // property declarations are not part of ES6, though they are valid in TypeScript:
    *         // static staticProperty;
    *         // property;
    *
    *         static staticMethod(p) { }
    *         method(p) { }
    *     }
    *
    *     // property (on constructor)
    *     Reflect.defineMetadata("custom:annotation", Number, Example, "staticProperty");
    *
    *     // property (on prototype)
    *     Reflect.defineMetadata("custom:annotation", Number, Example.prototype, "property");
    *
    *     // method (on constructor)
    *     Reflect.defineMetadata("custom:annotation", Number, Example, "staticMethod");
    *
    *     // method (on prototype)
    *     Reflect.defineMetadata("custom:annotation", Number, Example.prototype, "method");
    *
    *     // decorator factory as metadata-producing annotation.
    *     function MyAnnotation(options): PropertyDecorator {
    *         return (target, key) => Reflect.defineMetadata("custom:annotation", options, target, key);
    *     }
    *
    */
  export declare function defineMetadata(metadataKey: any, metadataValue: any, target: any, propertyKey: string | symbol): void;

  /**
    * Gets a value indicating whether the target object or its prototype chain has the provided metadata key defined.
    * @param metadataKey A key used to store and retrieve metadata.
    * @param target The target object on which the metadata is defined.
    * @returns `true` if the metadata key was defined on the target object or its prototype chain; otherwise, `false`.
    * @example
    *
    *     class Example {
    *     }
    *
    *     // constructor
    *     result = Reflect.hasMetadata("custom:annotation", Example);
    *
    */
  export declare function hasMetadata(metadataKey: any, target: any): boolean;

  /**
    * Gets a value indicating whether the target object or its prototype chain has the provided metadata key defined.
    * @param metadataKey A key used to store and retrieve metadata.
    * @param target The target object on which the metadata is defined.
    * @param propertyKey The property key for the target.
    * @returns `true` if the metadata key was defined on the target object or its prototype chain; otherwise, `false`.
    * @example
    *
    *     class Example {
    *         // property declarations are not part of ES6, though they are valid in TypeScript:
    *         // static staticProperty;
    *         // property;
    *
    *         static staticMethod(p) { }
    *         method(p) { }
    *     }
    *
    *     // property (on constructor)
    *     result = Reflect.hasMetadata("custom:annotation", Example, "staticProperty");
    *
    *     // property (on prototype)
    *     result = Reflect.hasMetadata("custom:annotation", Example.prototype, "property");
    *
    *     // method (on constructor)
    *     result = Reflect.hasMetadata("custom:annotation", Example, "staticMethod");
    *
    *     // method (on prototype)
    *     result = Reflect.hasMetadata("custom:annotation", Example.prototype, "method");
    *
    */
  export declare function hasMetadata(metadataKey: any, target: any, propertyKey: string | symbol): boolean;

  /**
    * Gets a value indicating whether the target object has the provided metadata key defined.
    * @param metadataKey A key used to store and retrieve metadata.
    * @param target The target object on which the metadata is defined.
    * @returns `true` if the metadata key was defined on the target object; otherwise, `false`.
    * @example
    *
    *     class Example {
    *     }
    *
    *     // constructor
    *     result = Reflect.hasOwnMetadata("custom:annotation", Example);
    *
    */
  export declare function hasOwnMetadata(metadataKey: any, target: any): boolean;

  /**
    * Gets a value indicating whether the target object has the provided metadata key defined.
    * @param metadataKey A key used to store and retrieve metadata.
    * @param target The target object on which the metadata is defined.
    * @param propertyKey The property key for the target.
    * @returns `true` if the metadata key was defined on the target object; otherwise, `false`.
    * @example
    *
    *     class Example {
    *         // property declarations are not part of ES6, though they are valid in TypeScript:
    *         // static staticProperty;
    *         // property;
    *
    *         static staticMethod(p) { }
    *         method(p) { }
    *     }
    *
    *     // property (on constructor)
    *     result = Reflect.hasOwnMetadata("custom:annotation", Example, "staticProperty");
    *
    *     // property (on prototype)
    *     result = Reflect.hasOwnMetadata("custom:annotation", Example.prototype, "property");
    *
    *     // method (on constructor)
    *     result = Reflect.hasOwnMetadata("custom:annotation", Example, "staticMethod");
    *
    *     // method (on prototype)
    *     result = Reflect.hasOwnMetadata("custom:annotation", Example.prototype, "method");
    *
    */
  export declare function hasOwnMetadata(metadataKey: any, target: any, propertyKey: string | symbol): boolean;

  /**
    * Gets the metadata value for the provided metadata key on the target object or its prototype chain.
    * @param metadataKey A key used to store and retrieve metadata.
    * @param target The target object on which the metadata is defined.
    * @returns The metadata value for the metadata key if found; otherwise, `undefined`.
    * @example
    *
    *     class Example {
    *     }
    *
    *     // constructor
    *     result = Reflect.getMetadata("custom:annotation", Example);
    *
    */
  export declare function getMetadata(metadataKey: any, target: any): any;

  /**
    * Gets the metadata value for the provided metadata key on the target object or its prototype chain.
    * @param metadataKey A key used to store and retrieve metadata.
    * @param target The target object on which the metadata is defined.
    * @param propertyKey The property key for the target.
    * @returns The metadata value for the metadata key if found; otherwise, `undefined`.
    * @example
    *
    *     class Example {
    *         // property declarations are not part of ES6, though they are valid in TypeScript:
    *         // static staticProperty;
    *         // property;
    *
    *         static staticMethod(p) { }
    *         method(p) { }
    *     }
    *
    *     // property (on constructor)
    *     result = Reflect.getMetadata("custom:annotation", Example, "staticProperty");
    *
    *     // property (on prototype)
    *     result = Reflect.getMetadata("custom:annotation", Example.prototype, "property");
    *
    *     // method (on constructor)
    *     result = Reflect.getMetadata("custom:annotation", Example, "staticMethod");
    *
    *     // method (on prototype)
    *     result = Reflect.getMetadata("custom:annotation", Example.prototype, "method");
    *
    */
  export declare function getMetadata(metadataKey: any, target: any, propertyKey: string | symbol): any;

  /**
    * Gets the metadata value for the provided metadata key on the target object.
    * @param metadataKey A key used to store and retrieve metadata.
    * @param target The target object on which the metadata is defined.
    * @returns The metadata value for the metadata key if found; otherwise, `undefined`.
    * @example
    *
    *     class Example {
    *     }
    *
    *     // constructor
    *     result = Reflect.getOwnMetadata("custom:annotation", Example);
    *
    */
  export declare function getOwnMetadata(metadataKey: any, target: any): any;

  /**
    * Gets the metadata value for the provided metadata key on the target object.
    * @param metadataKey A key used to store and retrieve metadata.
    * @param target The target object on which the metadata is defined.
    * @param propertyKey The property key for the target.
    * @returns The metadata value for the metadata key if found; otherwise, `undefined`.
    * @example
    *
    *     class Example {
    *         // property declarations are not part of ES6, though they are valid in TypeScript:
    *         // static staticProperty;
    *         // property;
    *
    *         static staticMethod(p) { }
    *         method(p) { }
    *     }
    *
    *     // property (on constructor)
    *     result = Reflect.getOwnMetadata("custom:annotation", Example, "staticProperty");
    *
    *     // property (on prototype)
    *     result = Reflect.getOwnMetadata("custom:annotation", Example.prototype, "property");
    *
    *     // method (on constructor)
    *     result = Reflect.getOwnMetadata("custom:annotation", Example, "staticMethod");
    *
    *     // method (on prototype)
    *     result = Reflect.getOwnMetadata("custom:annotation", Example.prototype, "method");
    *
    */
  export declare function getOwnMetadata(metadataKey: any, target: any, propertyKey: string | symbol): any;

  /**
    * Gets the metadata keys defined on the target object or its prototype chain.
    * @param target The target object on which the metadata is defined.
    * @returns An array of unique metadata keys.
    * @example
    *
    *     class Example {
    *     }
    *
    *     // constructor
    *     result = Reflect.getMetadataKeys(Example);
    *
    */
  export declare function getMetadataKeys(target: any): any[];

  /**
    * Gets the metadata keys defined on the target object or its prototype chain.
    * @param target The target object on which the metadata is defined.
    * @param propertyKey The property key for the target.
    * @returns An array of unique metadata keys.
    * @example
    *
    *     class Example {
    *         // property declarations are not part of ES6, though they are valid in TypeScript:
    *         // static staticProperty;
    *         // property;
    *
    *         static staticMethod(p) { }
    *         method(p) { }
    *     }
    *
    *     // property (on constructor)
    *     result = Reflect.getMetadataKeys(Example, "staticProperty");
    *
    *     // property (on prototype)
    *     result = Reflect.getMetadataKeys(Example.prototype, "property");
    *
    *     // method (on constructor)
    *     result = Reflect.getMetadataKeys(Example, "staticMethod");
    *
    *     // method (on prototype)
    *     result = Reflect.getMetadataKeys(Example.prototype, "method");
    *
    */
  export declare function getMetadataKeys(target: any, propertyKey: string | symbol): any[];

  /**
    * Gets the unique metadata keys defined on the target object.
    * @param target The target object on which the metadata is defined.
    * @returns An array of unique metadata keys.
    * @example
    *
    *     class Example {
    *     }
    *
    *     // constructor
    *     result = Reflect.getOwnMetadataKeys(Example);
    *
    */
  export declare function getOwnMetadataKeys(target: any): any[];

  /**
    * Gets the unique metadata keys defined on the target object.
    * @param target The target object on which the metadata is defined.
    * @param propertyKey The property key for the target.
    * @returns An array of unique metadata keys.
    * @example
    *
    *     class Example {
    *         // property declarations are not part of ES6, though they are valid in TypeScript:
    *         // static staticProperty;
    *         // property;
    *
    *         static staticMethod(p) { }
    *         method(p) { }
    *     }
    *
    *     // property (on constructor)
    *     result = Reflect.getOwnMetadataKeys(Example, "staticProperty");
    *
    *     // property (on prototype)
    *     result = Reflect.getOwnMetadataKeys(Example.prototype, "property");
    *
    *     // method (on constructor)
    *     result = Reflect.getOwnMetadataKeys(Example, "staticMethod");
    *
    *     // method (on prototype)
    *     result = Reflect.getOwnMetadataKeys(Example.prototype, "method");
    *
    */
  export declare function getOwnMetadataKeys(target: any, propertyKey: string | symbol): any[];

  /**
    * Deletes the metadata entry from the target object with the provided key.
    * @param metadataKey A key used to store and retrieve metadata.
    * @param target The target object on which the metadata is defined.
    * @returns `true` if the metadata entry was found and deleted; otherwise, false.
    * @example
    *
    *     class Example {
    *     }
    *
    *     // constructor
    *     result = Reflect.deleteMetadata("custom:annotation", Example);
    *
    */
  export declare function deleteMetadata(metadataKey: any, target: any): boolean;

  /**
    * Deletes the metadata entry from the target object with the provided key.
    * @param metadataKey A key used to store and retrieve metadata.
    * @param target The target object on which the metadata is defined.
    * @param propertyKey The property key for the target.
    * @returns `true` if the metadata entry was found and deleted; otherwise, false.
    * @example
    *
    *     class Example {
    *         // property declarations are not part of ES6, though they are valid in TypeScript:
    *         // static staticProperty;
    *         // property;
    *
    *         static staticMethod(p) { }
    *         method(p) { }
    *     }
    *
    *     // property (on constructor)
    *     result = Reflect.deleteMetadata("custom:annotation", Example, "staticProperty");
    *
    *     // property (on prototype)
    *     result = Reflect.deleteMetadata("custom:annotation", Example.prototype, "property");
    *
    *     // method (on constructor)
    *     result = Reflect.deleteMetadata("custom:annotation", Example, "staticMethod");
    *
    *     // method (on prototype)
    *     result = Reflect.deleteMetadata("custom:annotation", Example.prototype, "method");
    *
    */
  export declare function deleteMetadata(metadataKey: any, target: any, propertyKey: string | symbol): boolean;
  declare var self;
  (function (this: any, factory: (exporter: <K extends keyof typeof Reflect>(key: K, value: typeof Reflect[K]) => void) => void) {
    const root = typeof global === "object" ? global :
      typeof self === "object" ? self :
        typeof this === "object" ? this :
          Function("return this;")();

    let exporter = makeExporter(Reflect);
    if (typeof root.Reflect === "undefined") {
      root.Reflect = Reflect;
    }
    else {
      exporter = makeExporter(root.Reflect, exporter);
    }

    factory(exporter);

    function makeExporter(target: typeof Reflect, previous?: <K extends keyof typeof Reflect>(key: K, value: typeof Reflect[K]) => void) {
      return <K extends keyof typeof Reflect>(key: K, value: typeof Reflect[K]) => {
        if (typeof target[key] !== "function") {
          Object.defineProperty(target, key, { configurable: true, writable: true, value });
        }
        if (previous) previous(key, value);
      };
    }
  })
    (function (exporter) {
      const hasOwn = Object.prototype.hasOwnProperty;

      // feature test for Symbol support
      const supportsSymbol = typeof Symbol === "function";
      const toPrimitiveSymbol = supportsSymbol && typeof Symbol.toPrimitive !== "undefined" ? Symbol.toPrimitive : "@@toPrimitive";
      const iteratorSymbol = supportsSymbol && typeof Symbol.iterator !== "undefined" ? Symbol.iterator : "@@iterator";
      const supportsCreate = typeof Object.create === "function"; // feature test for Object.create support
      const supportsProto = { __proto__: [] } instanceof Array; // feature test for __proto__ support
      const downLevel = !supportsCreate && !supportsProto;

      const HashMap = {
        // create an object in dictionary mode (a.k.a. "slow" mode in v8)
        create: supportsCreate
          ? <V>() => MakeDictionary(Object.create(null) as HashMap<V>)
          : supportsProto
            ? <V>() => MakeDictionary({ __proto__: null as any } as HashMap<V>)
            : <V>() => MakeDictionary({} as HashMap<V>),

        has: downLevel
          ? <V>(map: HashMap<V>, key: string | number | symbol) => hasOwn.call(map, key)
          : <V>(map: HashMap<V>, key: string | number | symbol) => key in map,

        get: downLevel
          ? <V>(map: HashMap<V>, key: string | number | symbol): V | undefined => hasOwn.call(map, key) ? map[key as string | number] : undefined
          : <V>(map: HashMap<V>, key: string | number | symbol): V | undefined => map[key as string | number],
      };

      // Load global or shim versions of Map, Set, and WeakMap
      const functionPrototype = Object.getPrototypeOf(Function);
      const usePolyfill = typeof process === "object" && process.env && process.env["REFLECT_METADATA_USE_MAP_POLYFILL"] === "true";
      const _Map: typeof Map = !usePolyfill && typeof Map === "function" && typeof Map.prototype.entries === "function" ? Map : CreateMapPolyfill();
      const _Set: typeof Set = !usePolyfill && typeof Set === "function" && typeof Set.prototype.entries === "function" ? Set : CreateSetPolyfill();
      const _WeakMap: typeof WeakMap = !usePolyfill && typeof WeakMap === "function" ? WeakMap : CreateWeakMapPolyfill();

      // [[Metadata]] internal slot
      // https://rbuckton.github.io/reflect-metadata/#ordinary-object-internal-methods-and-internal-slots
      const Metadata = new _WeakMap<any, Map<string | symbol | undefined, Map<any, any>>>();

      function decorate(decorators: ClassDecorator[], target: Function): Function;
      function decorate(decorators: (PropertyDecorator | MethodDecorator)[], target: any, propertyKey: string | symbol, attributes?: PropertyDescriptor | null): PropertyDescriptor | undefined;
      function decorate(decorators: (PropertyDecorator | MethodDecorator)[], target: any, propertyKey: string | symbol, attributes: PropertyDescriptor): PropertyDescriptor;

      /**
       * Applies a set of decorators to a property of a target object.
       * @param decorators An array of decorators.
       * @param target The target object.
       * @param propertyKey (Optional) The property key to decorate.
       * @param attributes (Optional) The property descriptor for the target key.
       * @remarks Decorators are applied in reverse order.
       * @example
       *
       *     class Example {
       *         // property declarations are not part of ES6, though they are valid in TypeScript:
       *         // static staticProperty;
       *         // property;
       *
       *         constructor(p) { }
       *         static staticMethod(p) { }
       *         method(p) { }
       *     }
       *
       *     // constructor
       *     Example = Reflect.decorate(decoratorsArray, Example);
       *
       *     // property (on constructor)
       *     Reflect.decorate(decoratorsArray, Example, "staticProperty");
       *
       *     // property (on prototype)
       *     Reflect.decorate(decoratorsArray, Example.prototype, "property");
       *
       *     // method (on constructor)
       *     Object.defineProperty(Example, "staticMethod",
       *         Reflect.decorate(decoratorsArray, Example, "staticMethod",
       *             Object.getOwnPropertyDescriptor(Example, "staticMethod")));
       *
       *     // method (on prototype)
       *     Object.defineProperty(Example.prototype, "method",
       *         Reflect.decorate(decoratorsArray, Example.prototype, "method",
       *             Object.getOwnPropertyDescriptor(Example.prototype, "method")));
       *
       */
      function decorate(decorators: (ClassDecorator | MemberDecorator)[], target: any, propertyKey?: string | symbol, attributes?: PropertyDescriptor | null): PropertyDescriptor | Function | undefined {
        if (!IsUndefined(propertyKey)) {
          if (!IsArray(decorators)) throw new TypeError();
          if (!IsObject(target)) throw new TypeError();
          if (!IsObject(attributes) && !IsUndefined(attributes) && !IsNull(attributes)) throw new TypeError();
          if (IsNull(attributes)) attributes = undefined;
          propertyKey = ToPropertyKey(propertyKey);
          return DecorateProperty(<MemberDecorator[]>decorators, target, propertyKey, attributes);
        }
        else {
          if (!IsArray(decorators)) throw new TypeError();
          if (!IsConstructor(target)) throw new TypeError();
          return DecorateConstructor(<ClassDecorator[]>decorators, <Function>target);
        }
      }

      exporter("decorate", decorate);

      // 4.1.2 Reflect.metadata(metadataKey, metadataValue)
      // https://rbuckton.github.io/reflect-metadata/#reflect.metadata

      /**
       * A default metadata decorator factory that can be used on a class, class member, or parameter.
       * @param metadataKey The key for the metadata entry.
       * @param metadataValue The value for the metadata entry.
       * @returns A decorator function.
       * @remarks
       * If `metadataKey` is already defined for the target and target key, the
       * metadataValue for that key will be overwritten.
       * @example
       *
       *     // constructor
       *     @Reflect.metadata(key, value)
       *     class Example {
       *     }
       *
       *     // property (on constructor, TypeScript only)
       *     class Example {
       *         @Reflect.metadata(key, value)
       *         static staticProperty;
       *     }
       *
       *     // property (on prototype, TypeScript only)
       *     class Example {
       *         @Reflect.metadata(key, value)
       *         property;
       *     }
       *
       *     // method (on constructor)
       *     class Example {
       *         @Reflect.metadata(key, value)
       *         static staticMethod() { }
       *     }
       *
       *     // method (on prototype)
       *     class Example {
       *         @Reflect.metadata(key, value)
       *         method() { }
       *     }
       *
       */
      function metadata(metadataKey: any, metadataValue: any) {
        function decorator(target: Function): void;
        function decorator(target: any, propertyKey: string | symbol): void;
        function decorator(target: any, propertyKey?: string | symbol): void {
          if (!IsObject(target)) throw new TypeError();
          if (!IsUndefined(propertyKey) && !IsPropertyKey(propertyKey)) throw new TypeError();
          OrdinaryDefineOwnMetadata(metadataKey, metadataValue, target, propertyKey);
        }
        return decorator;
      }

      exporter("metadata", metadata);

      // 4.1.3 Reflect.defineMetadata(metadataKey, metadataValue, target [, propertyKey])
      // https://rbuckton.github.io/reflect-metadata/#reflect.definemetadata

      function defineMetadata(metadataKey: any, metadataValue: any, target: any): void;
      function defineMetadata(metadataKey: any, metadataValue: any, target: any, propertyKey: string | symbol): void;

      /**
       * Define a unique metadata entry on the target.
       * @param metadataKey A key used to store and retrieve metadata.
       * @param metadataValue A value that contains attached metadata.
       * @param target The target object on which to define metadata.
       * @param propertyKey (Optional) The property key for the target.
       * @example
       *
       *     class Example {
       *         // property declarations are not part of ES6, though they are valid in TypeScript:
       *         // static staticProperty;
       *         // property;
       *
       *         constructor(p) { }
       *         static staticMethod(p) { }
       *         method(p) { }
       *     }
       *
       *     // constructor
       *     Reflect.defineMetadata("custom:annotation", options, Example);
       *
       *     // property (on constructor)
       *     Reflect.defineMetadata("custom:annotation", options, Example, "staticProperty");
       *
       *     // property (on prototype)
       *     Reflect.defineMetadata("custom:annotation", options, Example.prototype, "property");
       *
       *     // method (on constructor)
       *     Reflect.defineMetadata("custom:annotation", options, Example, "staticMethod");
       *
       *     // method (on prototype)
       *     Reflect.defineMetadata("custom:annotation", options, Example.prototype, "method");
       *
       *     // decorator factory as metadata-producing annotation.
       *     function MyAnnotation(options): Decorator {
       *         return (target, key?) => Reflect.defineMetadata("custom:annotation", options, target, key);
       *     }
       *
       */
      function defineMetadata(metadataKey: any, metadataValue: any, target: any, propertyKey?: string | symbol): void {
        if (!IsObject(target)) throw new TypeError();
        if (!IsUndefined(propertyKey)) propertyKey = ToPropertyKey(propertyKey);
        return OrdinaryDefineOwnMetadata(metadataKey, metadataValue, target, propertyKey);
      }

      exporter("defineMetadata", defineMetadata);

      // 4.1.4 Reflect.hasMetadata(metadataKey, target [, propertyKey])
      // https://rbuckton.github.io/reflect-metadata/#reflect.hasmetadata

      function hasMetadata(metadataKey: any, target: any): boolean;
      function hasMetadata(metadataKey: any, target: any, propertyKey: string | symbol): boolean;

      /**
       * Gets a value indicating whether the target object or its prototype chain has the provided metadata key defined.
       * @param metadataKey A key used to store and retrieve metadata.
       * @param target The target object on which the metadata is defined.
       * @param propertyKey (Optional) The property key for the target.
       * @returns `true` if the metadata key was defined on the target object or its prototype chain; otherwise, `false`.
       * @example
       *
       *     class Example {
       *         // property declarations are not part of ES6, though they are valid in TypeScript:
       *         // static staticProperty;
       *         // property;
       *
       *         constructor(p) { }
       *         static staticMethod(p) { }
       *         method(p) { }
       *     }
       *
       *     // constructor
       *     result = Reflect.hasMetadata("custom:annotation", Example);
       *
       *     // property (on constructor)
       *     result = Reflect.hasMetadata("custom:annotation", Example, "staticProperty");
       *
       *     // property (on prototype)
       *     result = Reflect.hasMetadata("custom:annotation", Example.prototype, "property");
       *
       *     // method (on constructor)
       *     result = Reflect.hasMetadata("custom:annotation", Example, "staticMethod");
       *
       *     // method (on prototype)
       *     result = Reflect.hasMetadata("custom:annotation", Example.prototype, "method");
       *
       */
      function hasMetadata(metadataKey: any, target: any, propertyKey?: string | symbol): boolean {
        if (!IsObject(target)) throw new TypeError();
        if (!IsUndefined(propertyKey)) propertyKey = ToPropertyKey(propertyKey);
        return OrdinaryHasMetadata(metadataKey, target, propertyKey);
      }

      exporter("hasMetadata", hasMetadata);

      // 4.1.5 Reflect.hasOwnMetadata(metadataKey, target [, propertyKey])
      // https://rbuckton.github.io/reflect-metadata/#reflect-hasownmetadata

      function hasOwnMetadata(metadataKey: any, target: any): boolean;
      function hasOwnMetadata(metadataKey: any, target: any, propertyKey: string | symbol): boolean;

      /**
       * Gets a value indicating whether the target object has the provided metadata key defined.
       * @param metadataKey A key used to store and retrieve metadata.
       * @param target The target object on which the metadata is defined.
       * @param propertyKey (Optional) The property key for the target.
       * @returns `true` if the metadata key was defined on the target object; otherwise, `false`.
       * @example
       *
       *     class Example {
       *         // property declarations are not part of ES6, though they are valid in TypeScript:
       *         // static staticProperty;
       *         // property;
       *
       *         constructor(p) { }
       *         static staticMethod(p) { }
       *         method(p) { }
       *     }
       *
       *     // constructor
       *     result = Reflect.hasOwnMetadata("custom:annotation", Example);
       *
       *     // property (on constructor)
       *     result = Reflect.hasOwnMetadata("custom:annotation", Example, "staticProperty");
       *
       *     // property (on prototype)
       *     result = Reflect.hasOwnMetadata("custom:annotation", Example.prototype, "property");
       *
       *     // method (on constructor)
       *     result = Reflect.hasOwnMetadata("custom:annotation", Example, "staticMethod");
       *
       *     // method (on prototype)
       *     result = Reflect.hasOwnMetadata("custom:annotation", Example.prototype, "method");
       *
       */
      function hasOwnMetadata(metadataKey: any, target: any, propertyKey?: string | symbol): boolean {
        if (!IsObject(target)) throw new TypeError();
        if (!IsUndefined(propertyKey)) propertyKey = ToPropertyKey(propertyKey);
        return OrdinaryHasOwnMetadata(metadataKey, target, propertyKey);
      }

      exporter("hasOwnMetadata", hasOwnMetadata);

      // 4.1.6 Reflect.getMetadata(metadataKey, target [, propertyKey])
      // https://rbuckton.github.io/reflect-metadata/#reflect-getmetadata

      function getMetadata(metadataKey: any, target: any): any;
      function getMetadata(metadataKey: any, target: any, propertyKey: string | symbol): any;

      /**
       * Gets the metadata value for the provided metadata key on the target object or its prototype chain.
       * @param metadataKey A key used to store and retrieve metadata.
       * @param target The target object on which the metadata is defined.
       * @param propertyKey (Optional) The property key for the target.
       * @returns The metadata value for the metadata key if found; otherwise, `undefined`.
       * @example
       *
       *     class Example {
       *         // property declarations are not part of ES6, though they are valid in TypeScript:
       *         // static staticProperty;
       *         // property;
       *
       *         constructor(p) { }
       *         static staticMethod(p) { }
       *         method(p) { }
       *     }
       *
       *     // constructor
       *     result = Reflect.getMetadata("custom:annotation", Example);
       *
       *     // property (on constructor)
       *     result = Reflect.getMetadata("custom:annotation", Example, "staticProperty");
       *
       *     // property (on prototype)
       *     result = Reflect.getMetadata("custom:annotation", Example.prototype, "property");
       *
       *     // method (on constructor)
       *     result = Reflect.getMetadata("custom:annotation", Example, "staticMethod");
       *
       *     // method (on prototype)
       *     result = Reflect.getMetadata("custom:annotation", Example.prototype, "method");
       *
       */
      function getMetadata(metadataKey: any, target: any, propertyKey?: string | symbol): any {
        if (!IsObject(target)) throw new TypeError();
        if (!IsUndefined(propertyKey)) propertyKey = ToPropertyKey(propertyKey);
        return OrdinaryGetMetadata(metadataKey, target, propertyKey);
      }

      exporter("getMetadata", getMetadata);

      // 4.1.7 Reflect.getOwnMetadata(metadataKey, target [, propertyKey])
      // https://rbuckton.github.io/reflect-metadata/#reflect-getownmetadata

      function getOwnMetadata(metadataKey: any, target: any): any;
      function getOwnMetadata(metadataKey: any, target: any, propertyKey: string | symbol): any;

      /**
       * Gets the metadata value for the provided metadata key on the target object.
       * @param metadataKey A key used to store and retrieve metadata.
       * @param target The target object on which the metadata is defined.
       * @param propertyKey (Optional) The property key for the target.
       * @returns The metadata value for the metadata key if found; otherwise, `undefined`.
       * @example
       *
       *     class Example {
       *         // property declarations are not part of ES6, though they are valid in TypeScript:
       *         // static staticProperty;
       *         // property;
       *
       *         constructor(p) { }
       *         static staticMethod(p) { }
       *         method(p) { }
       *     }
       *
       *     // constructor
       *     result = Reflect.getOwnMetadata("custom:annotation", Example);
       *
       *     // property (on constructor)
       *     result = Reflect.getOwnMetadata("custom:annotation", Example, "staticProperty");
       *
       *     // property (on prototype)
       *     result = Reflect.getOwnMetadata("custom:annotation", Example.prototype, "property");
       *
       *     // method (on constructor)
       *     result = Reflect.getOwnMetadata("custom:annotation", Example, "staticMethod");
       *
       *     // method (on prototype)
       *     result = Reflect.getOwnMetadata("custom:annotation", Example.prototype, "method");
       *
       */
      function getOwnMetadata(metadataKey: any, target: any, propertyKey?: string | symbol): any {
        if (!IsObject(target)) throw new TypeError();
        if (!IsUndefined(propertyKey)) propertyKey = ToPropertyKey(propertyKey);
        return OrdinaryGetOwnMetadata(metadataKey, target, propertyKey);
      }

      exporter("getOwnMetadata", getOwnMetadata);

      // 4.1.8 Reflect.getMetadataKeys(target [, propertyKey])
      // https://rbuckton.github.io/reflect-metadata/#reflect-getmetadatakeys

      function getMetadataKeys(target: any): any[];
      function getMetadataKeys(target: any, propertyKey: string | symbol): any[];

      /**
       * Gets the metadata keys defined on the target object or its prototype chain.
       * @param target The target object on which the metadata is defined.
       * @param propertyKey (Optional) The property key for the target.
       * @returns An array of unique metadata keys.
       * @example
       *
       *     class Example {
       *         // property declarations are not part of ES6, though they are valid in TypeScript:
       *         // static staticProperty;
       *         // property;
       *
       *         constructor(p) { }
       *         static staticMethod(p) { }
       *         method(p) { }
       *     }
       *
       *     // constructor
       *     result = Reflect.getMetadataKeys(Example);
       *
       *     // property (on constructor)
       *     result = Reflect.getMetadataKeys(Example, "staticProperty");
       *
       *     // property (on prototype)
       *     result = Reflect.getMetadataKeys(Example.prototype, "property");
       *
       *     // method (on constructor)
       *     result = Reflect.getMetadataKeys(Example, "staticMethod");
       *
       *     // method (on prototype)
       *     result = Reflect.getMetadataKeys(Example.prototype, "method");
       *
       */
      function getMetadataKeys(target: any, propertyKey?: string | symbol): any[] {
        if (!IsObject(target)) throw new TypeError();
        if (!IsUndefined(propertyKey)) propertyKey = ToPropertyKey(propertyKey);
        return OrdinaryMetadataKeys(target, propertyKey);
      }

      exporter("getMetadataKeys", getMetadataKeys);

      // 4.1.9 Reflect.getOwnMetadataKeys(target [, propertyKey])
      // https://rbuckton.github.io/reflect-metadata/#reflect-getownmetadata

      function getOwnMetadataKeys(target: any): any[];
      function getOwnMetadataKeys(target: any, propertyKey: string | symbol): any[];

      /**
       * Gets the unique metadata keys defined on the target object.
       * @param target The target object on which the metadata is defined.
       * @param propertyKey (Optional) The property key for the target.
       * @returns An array of unique metadata keys.
       * @example
       *
       *     class Example {
       *         // property declarations are not part of ES6, though they are valid in TypeScript:
       *         // static staticProperty;
       *         // property;
       *
       *         constructor(p) { }
       *         static staticMethod(p) { }
       *         method(p) { }
       *     }
       *
       *     // constructor
       *     result = Reflect.getOwnMetadataKeys(Example);
       *
       *     // property (on constructor)
       *     result = Reflect.getOwnMetadataKeys(Example, "staticProperty");
       *
       *     // property (on prototype)
       *     result = Reflect.getOwnMetadataKeys(Example.prototype, "property");
       *
       *     // method (on constructor)
       *     result = Reflect.getOwnMetadataKeys(Example, "staticMethod");
       *
       *     // method (on prototype)
       *     result = Reflect.getOwnMetadataKeys(Example.prototype, "method");
       *
       */
      function getOwnMetadataKeys(target: any, propertyKey?: string | symbol): any[] {
        if (!IsObject(target)) throw new TypeError();
        if (!IsUndefined(propertyKey)) propertyKey = ToPropertyKey(propertyKey);
        return OrdinaryOwnMetadataKeys(target, propertyKey);
      }

      exporter("getOwnMetadataKeys", getOwnMetadataKeys);

      // 4.1.10 Reflect.deleteMetadata(metadataKey, target [, propertyKey])
      // https://rbuckton.github.io/reflect-metadata/#reflect-deletemetadata

      function deleteMetadata(metadataKey: any, target: any): boolean;
      function deleteMetadata(metadataKey: any, target: any, propertyKey: string | symbol): boolean;

      /**
       * Deletes the metadata entry from the target object with the provided key.
       * @param metadataKey A key used to store and retrieve metadata.
       * @param target The target object on which the metadata is defined.
       * @param propertyKey (Optional) The property key for the target.
       * @returns `true` if the metadata entry was found and deleted; otherwise, false.
       * @example
       *
       *     class Example {
       *         // property declarations are not part of ES6, though they are valid in TypeScript:
       *         // static staticProperty;
       *         // property;
       *
       *         constructor(p) { }
       *         static staticMethod(p) { }
       *         method(p) { }
       *     }
       *
       *     // constructor
       *     result = Reflect.deleteMetadata("custom:annotation", Example);
       *
       *     // property (on constructor)
       *     result = Reflect.deleteMetadata("custom:annotation", Example, "staticProperty");
       *
       *     // property (on prototype)
       *     result = Reflect.deleteMetadata("custom:annotation", Example.prototype, "property");
       *
       *     // method (on constructor)
       *     result = Reflect.deleteMetadata("custom:annotation", Example, "staticMethod");
       *
       *     // method (on prototype)
       *     result = Reflect.deleteMetadata("custom:annotation", Example.prototype, "method");
       *
       */
      function deleteMetadata(metadataKey: any, target: any, propertyKey?: string | symbol): boolean {
        if (!IsObject(target)) throw new TypeError();
        if (!IsUndefined(propertyKey)) propertyKey = ToPropertyKey(propertyKey);
        const metadataMap = GetOrCreateMetadataMap(target, propertyKey, /*Create*/ false);
        if (IsUndefined(metadataMap)) return false;
        if (!metadataMap.delete(metadataKey)) return false;
        if (metadataMap.size > 0) return true;
        const targetMetadata = Metadata.get(target);
        targetMetadata.delete(propertyKey);
        if (targetMetadata.size > 0) return true;
        Metadata.delete(target);
        return true;
      }

      exporter("deleteMetadata", deleteMetadata);

      function DecorateConstructor(decorators: ClassDecorator[], target: Function): Function {
        for (let i = decorators.length - 1; i >= 0; --i) {
          const decorator = decorators[i];
          const decorated = decorator(target);
          if (!IsUndefined(decorated) && !IsNull(decorated)) {
            if (!IsConstructor(decorated)) throw new TypeError();
            target = <Function>decorated;
          }
        }
        return target;
      }

      function DecorateProperty(decorators: MemberDecorator[], target: any, propertyKey: string | symbol, descriptor: PropertyDescriptor | undefined): PropertyDescriptor | undefined {
        for (let i = decorators.length - 1; i >= 0; --i) {
          const decorator = decorators[i];
          const decorated = decorator(target, propertyKey, descriptor);
          if (!IsUndefined(decorated) && !IsNull(decorated)) {
            if (!IsObject(decorated)) throw new TypeError();
            descriptor = <PropertyDescriptor>decorated;
          }
        }
        return descriptor;
      }

      // 2.1.1 GetOrCreateMetadataMap(O, P, Create)
      // https://rbuckton.github.io/reflect-metadata/#getorcreatemetadatamap
      function GetOrCreateMetadataMap(O: any, P: string | symbol | undefined, Create: true): Map<any, any>;
      function GetOrCreateMetadataMap(O: any, P: string | symbol | undefined, Create: false): Map<any, any> | undefined;
      function GetOrCreateMetadataMap(O: any, P: string | symbol | undefined, Create: boolean): Map<any, any> | undefined {
        let targetMetadata = Metadata.get(O);
        if (IsUndefined(targetMetadata)) {
          if (!Create) return undefined;
          targetMetadata = new _Map<string | symbol | undefined, Map<any, any>>();
          Metadata.set(O, targetMetadata);
        }
        let metadataMap = targetMetadata.get(P);
        if (IsUndefined(metadataMap)) {
          if (!Create) return undefined;
          metadataMap = new _Map<any, any>();
          targetMetadata.set(P, metadataMap);
        }
        return metadataMap;
      }

      // 3.1.1.1 OrdinaryHasMetadata(MetadataKey, O, P)
      // https://rbuckton.github.io/reflect-metadata/#ordinaryhasmetadata
      function OrdinaryHasMetadata(MetadataKey: any, O: any, P: string | symbol | undefined): boolean {
        const hasOwn = OrdinaryHasOwnMetadata(MetadataKey, O, P);
        if (hasOwn) return true;
        const parent = OrdinaryGetPrototypeOf(O);
        if (!IsNull(parent)) return OrdinaryHasMetadata(MetadataKey, parent, P);
        return false;
      }

      // 3.1.2.1 OrdinaryHasOwnMetadata(MetadataKey, O, P)
      // https://rbuckton.github.io/reflect-metadata/#ordinaryhasownmetadata
      function OrdinaryHasOwnMetadata(MetadataKey: any, O: any, P: string | symbol | undefined): boolean {
        const metadataMap = GetOrCreateMetadataMap(O, P, /*Create*/ false);
        if (IsUndefined(metadataMap)) return false;
        return ToBoolean(metadataMap.has(MetadataKey));
      }

      // 3.1.3.1 OrdinaryGetMetadata(MetadataKey, O, P)
      // https://rbuckton.github.io/reflect-metadata/#ordinarygetmetadata
      function OrdinaryGetMetadata(MetadataKey: any, O: any, P: string | symbol | undefined): any {
        const hasOwn = OrdinaryHasOwnMetadata(MetadataKey, O, P);
        if (hasOwn) return OrdinaryGetOwnMetadata(MetadataKey, O, P);
        const parent = OrdinaryGetPrototypeOf(O);
        if (!IsNull(parent)) return OrdinaryGetMetadata(MetadataKey, parent, P);
        return undefined;
      }

      // 3.1.4.1 OrdinaryGetOwnMetadata(MetadataKey, O, P)
      // https://rbuckton.github.io/reflect-metadata/#ordinarygetownmetadata
      function OrdinaryGetOwnMetadata(MetadataKey: any, O: any, P: string | symbol | undefined): any {
        const metadataMap = GetOrCreateMetadataMap(O, P, /*Create*/ false);
        if (IsUndefined(metadataMap)) return undefined;
        return metadataMap.get(MetadataKey);
      }

      // 3.1.5.1 OrdinaryDefineOwnMetadata(MetadataKey, MetadataValue, O, P)
      // https://rbuckton.github.io/reflect-metadata/#ordinarydefineownmetadata
      function OrdinaryDefineOwnMetadata(MetadataKey: any, MetadataValue: any, O: any, P: string | symbol | undefined): void {
        const metadataMap = GetOrCreateMetadataMap(O, P, /*Create*/ true);
        metadataMap.set(MetadataKey, MetadataValue);
      }

      // 3.1.6.1 OrdinaryMetadataKeys(O, P)
      // https://rbuckton.github.io/reflect-metadata/#ordinarymetadatakeys
      function OrdinaryMetadataKeys(O: any, P: string | symbol | undefined): any[] {
        const ownKeys = OrdinaryOwnMetadataKeys(O, P);
        const parent = OrdinaryGetPrototypeOf(O);
        if (parent === null) return ownKeys;
        const parentKeys = OrdinaryMetadataKeys(parent, P);
        if (parentKeys.length <= 0) return ownKeys;
        if (ownKeys.length <= 0) return parentKeys;
        const set = new _Set<any>();
        const keys: any[] = [];
        for (const key of ownKeys) {
          const hasKey = set.has(key);
          if (!hasKey) {
            set.add(key);
            keys.push(key);
          }
        }
        for (const key of parentKeys) {
          const hasKey = set.has(key);
          if (!hasKey) {
            set.add(key);
            keys.push(key);
          }
        }
        return keys;
      }

      // 3.1.7.1 OrdinaryOwnMetadataKeys(O, P)
      // https://rbuckton.github.io/reflect-metadata/#ordinaryownmetadatakeys
      function OrdinaryOwnMetadataKeys(O: any, P: string | symbol | undefined): any[] {
        const keys: any[] = [];
        const metadataMap = GetOrCreateMetadataMap(O, P, /*Create*/ false);
        if (IsUndefined(metadataMap)) return keys;
        const keysObj = metadataMap.keys();
        const iterator = GetIterator(keysObj);
        let k = 0;
        while (true) {
          const next = IteratorStep(iterator);
          if (!next) {
            keys.length = k;
            return keys;
          }
          const nextValue = IteratorValue(next);
          try {
            keys[k] = nextValue;
          }
          catch (e) {
            try {
              IteratorClose(iterator);
            }
            finally {
              throw e;
            }
          }
          k++;
        }
      }

      // 6 ECMAScript Data Typ0es and Values
      // https://tc39.github.io/ecma262/#sec-ecmascript-data-types-and-values
      function Type(x: any): Tag {
        if (x === null) return Tag.Null;
        switch (typeof x) {
          case "undefined": return Tag.Undefined;
          case "boolean": return Tag.Boolean;
          case "string": return Tag.String;
          case "symbol": return Tag.Symbol;
          case "number": return Tag.Number;
          case "object": return x === null ? Tag.Null : Tag.Object;
          default: return Tag.Object;
        }
      }

      // 6.1 ECMAScript Language Types
      // https://tc39.github.io/ecma262/#sec-ecmascript-language-types
      const enum Tag {
        Undefined,
        Null,
        Boolean,
        String,
        Symbol,
        Number,
        Object
      }

      // 6.1.1 The Undefined Type
      // https://tc39.github.io/ecma262/#sec-ecmascript-language-types-undefined-type
      function IsUndefined(x: any): x is undefined {
        return x === undefined;
      }

      // 6.1.2 The Null Type
      // https://tc39.github.io/ecma262/#sec-ecmascript-language-types-null-type
      function IsNull(x: any): x is null {
        return x === null;
      }

      // 6.1.5 The Symbol Type
      // https://tc39.github.io/ecma262/#sec-ecmascript-language-types-symbol-type
      function IsSymbol(x: any): x is symbol {
        return typeof x === "symbol";
      }

      // 6.1.7 The Object Type
      // https://tc39.github.io/ecma262/#sec-object-type
      function IsObject<T>(x: T | undefined | null | boolean | string | symbol | number): x is T {
        return typeof x === "object" ? x !== null : typeof x === "function";
      }

      // 7.1 Type Conversion
      // https://tc39.github.io/ecma262/#sec-type-conversion

      // 7.1.1 ToPrimitive(input [, PreferredType])
      // https://tc39.github.io/ecma262/#sec-toprimitive
      function ToPrimitive(input: any, PreferredType?: Tag): undefined | null | boolean | string | symbol | number {
        switch (Type(input)) {
          case Tag.Undefined: return input;
          case Tag.Null: return input;
          case Tag.Boolean: return input;
          case Tag.String: return input;
          case Tag.Symbol: return input;
          case Tag.Number: return input;
        }
        const hint: "string" | "number" | "default" = PreferredType === Tag.String ? "string" : PreferredType === Tag.Number ? "number" : "default";
        const exoticToPrim = GetMethod(input, toPrimitiveSymbol);
        if (exoticToPrim !== undefined) {
          const result = exoticToPrim.call(input, hint);
          if (IsObject(result)) throw new TypeError();
          return result;
        }
        return OrdinaryToPrimitive(input, hint === "default" ? "number" : hint);
      }

      // 7.1.1.1 OrdinaryToPrimitive(O, hint)
      // https://tc39.github.io/ecma262/#sec-ordinarytoprimitive
      function OrdinaryToPrimitive(O: any, hint: "string" | "number"): undefined | null | boolean | string | symbol | number {
        if (hint === "string") {
          const toString = O.toString;
          if (IsCallable(toString)) {
            const result = toString.call(O);
            if (!IsObject(result)) return result;
          }
          const valueOf = O.valueOf;
          if (IsCallable(valueOf)) {
            const result = valueOf.call(O);
            if (!IsObject(result)) return result;
          }
        }
        else {
          const valueOf = O.valueOf;
          if (IsCallable(valueOf)) {
            const result = valueOf.call(O);
            if (!IsObject(result)) return result;
          }
          const toString = O.toString;
          if (IsCallable(toString)) {
            const result = toString.call(O);
            if (!IsObject(result)) return result;
          }
        }
        throw new TypeError();
      }

      // 7.1.2 ToBoolean(argument)
      // https://tc39.github.io/ecma262/2016/#sec-toboolean
      function ToBoolean(argument: any): boolean {
        return !!argument;
      }

      // 7.1.12 ToString(argument)
      // https://tc39.github.io/ecma262/#sec-tostring
      function ToString(argument: any): string {
        return "" + argument;
      }

      // 7.1.14 ToPropertyKey(argument)
      // https://tc39.github.io/ecma262/#sec-topropertykey
      function ToPropertyKey(argument: any): string | symbol {
        const key = ToPrimitive(argument, Tag.String);
        if (IsSymbol(key)) return key;
        return ToString(key);
      }

      // 7.2 Testing and Comparison Operations
      // https://tc39.github.io/ecma262/#sec-testing-and-comparison-operations

      // 7.2.2 IsArray(argument)
      // https://tc39.github.io/ecma262/#sec-isarray
      function IsArray(argument: any): argument is any[] {
        return Array.isArray
          ? Array.isArray(argument)
          : argument instanceof Object
            ? argument instanceof Array
            : Object.prototype.toString.call(argument) === "[object Array]";
      }

      // 7.2.3 IsCallable(argument)
      // https://tc39.github.io/ecma262/#sec-iscallable
      function IsCallable(argument: any): argument is Function {
        // NOTE: This is an approximation as we cannot check for [[Call]] internal method.
        return typeof argument === "function";
      }

      // 7.2.4 IsConstructor(argument)
      // https://tc39.github.io/ecma262/#sec-isconstructor
      function IsConstructor(argument: any): argument is Function {
        // NOTE: This is an approximation as we cannot check for [[Construct]] internal method.
        return typeof argument === "function";
      }

      // 7.2.7 IsPropertyKey(argument)
      // https://tc39.github.io/ecma262/#sec-ispropertykey
      function IsPropertyKey(argument: any): argument is string | symbol {
        switch (Type(argument)) {
          case Tag.String: return true;
          case Tag.Symbol: return true;
          default: return false;
        }
      }

      // 7.3 Operations on Objects
      // https://tc39.github.io/ecma262/#sec-operations-on-objects

      // 7.3.9 GetMethod(V, P)
      // https://tc39.github.io/ecma262/#sec-getmethod
      function GetMethod(V: any, P: any): Function | undefined {
        const func = V[P];
        if (func === undefined || func === null) return undefined;
        if (!IsCallable(func)) throw new TypeError();
        return func;
      }

      // 7.4 Operations on Iterator Objects
      // https://tc39.github.io/ecma262/#sec-operations-on-iterator-objects

      function GetIterator<T>(obj: Iterable<T>): Iterator<T> {
        const method = GetMethod(obj, iteratorSymbol);
        if (!IsCallable(method)) throw new TypeError(); // from Call
        const iterator = method.call(obj);
        if (!IsObject(iterator)) throw new TypeError();
        return iterator;
      }

      // 7.4.4 IteratorValue(iterResult)
      // https://tc39.github.io/ecma262/2016/#sec-iteratorvalue
      function IteratorValue<T>(iterResult: IteratorResult<T>): T {
        return iterResult.value;
      }

      // 7.4.5 IteratorStep(iterator)
      // https://tc39.github.io/ecma262/#sec-iteratorstep
      function IteratorStep<T>(iterator: Iterator<T>): IteratorResult<T> | false {
        const result = iterator.next();
        return result.done ? false : result;
      }

      // 7.4.6 IteratorClose(iterator, completion)
      // https://tc39.github.io/ecma262/#sec-iteratorclose
      function IteratorClose<T>(iterator: Iterator<T>) {
        const f = iterator["return"];
        if (f) f.call(iterator);
      }

      // 9.1 Ordinary Object Internal Methods and Internal Slots
      // https://tc39.github.io/ecma262/#sec-ordinary-object-internal-methods-and-internal-slots

      // 9.1.1.1 OrdinaryGetPrototypeOf(O)
      // https://tc39.github.io/ecma262/#sec-ordinarygetprototypeof
      function OrdinaryGetPrototypeOf(O: any): any {
        const proto = Object.getPrototypeOf(O);
        if (typeof O !== "function" || O === functionPrototype) return proto;

        // TypeScript doesn't set __proto__ in ES5, as it's non-standard.
        // Try to determine the superclass constructor. Compatible implementations
        // must either set __proto__ on a subclass constructor to the superclass constructor,
        // or ensure each class has a valid `constructor` property on its prototype that
        // points back to the constructor.

        // If this is not the same as Function.[[Prototype]], then this is definately inherited.
        // This is the case when in ES6 or when using __proto__ in a compatible browser.
        if (proto !== functionPrototype) return proto;

        // If the super prototype is Object.prototype, null, or undefined, then we cannot determine the heritage.
        const prototype = O.prototype;
        const prototypeProto = prototype && Object.getPrototypeOf(prototype);
        if (prototypeProto == null || prototypeProto === Object.prototype) return proto;

        // If the constructor was not a function, then we cannot determine the heritage.
        const constructor = prototypeProto.constructor;
        if (typeof constructor !== "function") return proto;

        // If we have some kind of self-reference, then we cannot determine the heritage.
        if (constructor === O) return proto;

        // we have a pretty good guess at the heritage.
        return constructor;
      }

      // naive Map shim
      function CreateMapPolyfill(): MapConstructor {
        const cacheSentinel = {};
        const arraySentinel: any[] = [];

        class MapIterator<K, V, R extends (K | V | [K, V])> implements IterableIterator<R> {
          private _keys: K[];
          private _values: V[];
          private _index = 0;
          private _selector: (key: K, value: V) => R;
          constructor(keys: K[], values: V[], selector: (key: K, value: V) => R) {
            this._keys = keys;
            this._values = values;
            this._selector = selector;
          }
          "@@iterator"() { return this; }
          [iteratorSymbol]() { return this; }
          next(): IteratorResult<R> {
            const index = this._index;
            if (index >= 0 && index < this._keys.length) {
              const result = this._selector(this._keys[index], this._values[index]);
              if (index + 1 >= this._keys.length) {
                this._index = -1;
                this._keys = arraySentinel;
                this._values = arraySentinel;
              }
              else {
                this._index++;
              }
              return { value: result, done: false };
            }
            return { value: <never>undefined, done: true };
          }
          throw(error: any): IteratorResult<R> {
            if (this._index >= 0) {
              this._index = -1;
              this._keys = arraySentinel;
              this._values = arraySentinel;
            }
            throw error;
          }
          return(value?: R): IteratorResult<R> {
            if (this._index >= 0) {
              this._index = -1;
              this._keys = arraySentinel;
              this._values = arraySentinel;
            }
            return { value: <never>value, done: true };
          }
        }

        return class Map<K, V> {
          private _keys: K[] = [];
          private _values: (V | undefined)[] = [];
          private _cacheKey = cacheSentinel;
          private _cacheIndex = -2;
          get size() { return this._keys.length; }
          has(key: K): boolean { return this._find(key, /*insert*/ false) >= 0; }
          get(key: K): V | undefined {
            const index = this._find(key, /*insert*/ false);
            return index >= 0 ? this._values[index] : undefined;
          }
          set(key: K, value: V): this {
            const index = this._find(key, /*insert*/ true);
            this._values[index] = value;
            return this;
          }
          delete(key: K): boolean {
            const index = this._find(key, /*insert*/ false);
            if (index >= 0) {
              const size = this._keys.length;
              for (let i = index + 1; i < size; i++) {
                this._keys[i - 1] = this._keys[i];
                this._values[i - 1] = this._values[i];
              }
              this._keys.length--;
              this._values.length--;
              if (key === this._cacheKey) {
                this._cacheKey = cacheSentinel;
                this._cacheIndex = -2;
              }
              return true;
            }
            return false;
          }
          clear(): void {
            this._keys.length = 0;
            this._values.length = 0;
            this._cacheKey = cacheSentinel;
            this._cacheIndex = -2;
          }
          keys() { return new MapIterator(this._keys, this._values, getKey); }
          values() { return new MapIterator(this._keys, this._values, getValue); }
          entries() { return new MapIterator(this._keys, this._values, getEntry); }
          "@@iterator"() { return this.entries(); }
          [iteratorSymbol]() { return this.entries(); }
          private _find(key: K, insert?: boolean): number {
            if (this._cacheKey !== key) {
              this._cacheIndex = this._keys.indexOf(this._cacheKey = key);
            }
            if (this._cacheIndex < 0 && insert) {
              this._cacheIndex = this._keys.length;
              this._keys.push(key);
              this._values.push(undefined);
            }
            return this._cacheIndex;
          }
        };

        function getKey<K, V>(key: K, _: V) {
          return key;
        }

        function getValue<K, V>(_: K, value: V) {
          return value;
        }

        function getEntry<K, V>(key: K, value: V) {
          return [key, value] as [K, V];
        }
      }

      // naive Set shim
      function CreateSetPolyfill(): SetConstructor {
        return class Set<T> {
          private _map = new _Map<any, any>();
          get size() { return this._map.size; }
          has(value: T): boolean { return this._map.has(value); }
          add(value: T): Set<T> { return this._map.set(value, value), this; }
          delete(value: T): boolean { return this._map.delete(value); }
          clear(): void { this._map.clear(); }
          keys() { return this._map.keys(); }
          values() { return this._map.values(); }
          entries() { return this._map.entries(); }
          "@@iterator"() { return this.keys(); }
          [iteratorSymbol]() { return this.keys(); }
        };
      }

      // naive WeakMap shim
      function CreateWeakMapPolyfill(): WeakMapConstructor {
        const UUID_SIZE = 16;
        const keys = HashMap.create<boolean>();
        const rootKey = CreateUniqueKey();
        return class WeakMap<K, V> {
          private _key = CreateUniqueKey();
          has(target: K): boolean {
            const table = GetOrCreateWeakMapTable<K>(target, /*create*/ false);
            return table !== undefined ? HashMap.has(table, this._key) : false;
          }
          get(target: K): V {
            const table = GetOrCreateWeakMapTable<K>(target, /*create*/ false);
            return table !== undefined ? HashMap.get(table, this._key) : undefined;
          }
          set(target: K, value: V): WeakMap<K, V> {
            const table = GetOrCreateWeakMapTable<K>(target, /*create*/ true);
            table[this._key] = value;
            return this;
          }
          delete(target: K): boolean {
            const table = GetOrCreateWeakMapTable<K>(target, /*create*/ false);
            return table !== undefined ? delete table[this._key] : false;
          }
          clear(): void {
            // NOTE: not a real clear, just makes the previous data unreachable
            this._key = CreateUniqueKey();
          }
        };

        function CreateUniqueKey(): string {
          let key: string;
          do key = "@@WeakMap@@" + CreateUUID();
          while (HashMap.has(keys, key));
          keys[key] = true;
          return key;
        }

        function GetOrCreateWeakMapTable<K>(target: K, create: true): HashMap<any>;
        function GetOrCreateWeakMapTable<K>(target: K, create: false): HashMap<any> | undefined;
        function GetOrCreateWeakMapTable<K>(target: K, create: boolean): HashMap<any> | undefined {
          if (!hasOwn.call(target, rootKey)) {
            if (!create) return undefined;
            Object.defineProperty(target, rootKey, { value: HashMap.create<any>() });
          }
          return (<any>target)[rootKey];
        }

        function FillRandomBytes(buffer: BufferLike, size: number): BufferLike {
          for (let i = 0; i < size; ++i) buffer[i] = Math.random() * 0xff | 0;
          return buffer;
        }

        function GenRandomBytes(size: number): BufferLike {
          if (typeof Uint8Array === "function") {
            if (typeof crypto !== "undefined") return crypto.getRandomValues(new Uint8Array(size)) as Uint8Array;
            if (typeof msCrypto !== "undefined") return msCrypto.getRandomValues(new Uint8Array(size)) as Uint8Array;
            return FillRandomBytes(new Uint8Array(size), size);
          }
          return FillRandomBytes(new Array(size), size);
        }

        function CreateUUID() {
          const data = GenRandomBytes(UUID_SIZE);
          // mark as random - RFC 4122 § 4.4
          data[6] = data[6] & 0x4f | 0x40;
          data[8] = data[8] & 0xbf | 0x80;
          let result = "";
          for (let offset = 0; offset < UUID_SIZE; ++offset) {
            const byte = data[offset];
            if (offset === 4 || offset === 6 || offset === 8) result += "-";
            if (byte < 16) result += "0";
            result += byte.toString(16).toLowerCase();
          }
          return result;
        }
      }

      // uses a heuristic used by v8 and chakra to force an object into dictionary mode.
      function MakeDictionary<T>(obj: T): T {
        (<any>obj).__ = undefined;
        delete (<any>obj).__;
        return obj;
      }
    });
}